package com.ganwei.springcloud.config;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLB  implements LoadBalancer{

    private AtomicInteger atomicInteger = new AtomicInteger(0);


    public final int getAndIncrement(){
        int current = 0;
        int next = 0;
        do {
            current = this.atomicInteger.get();
            next = current >= 2147483647 ? 0:current+1;
        }while(this.atomicInteger.compareAndSet(current,next));
        System.out.println("******第几次访问next:"+next);
        return next;
    }

    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement() % serviceInstances.size();

        return serviceInstances.get(index);
    }
}
